ladder logic to fb diagrams - PLCS.net

chanuajohnson · November 9th, 2005, 11:00 AM

Hi all, i am an undergraduate student currently doin aproject, I need help i have no idea how to do what i have to do.

I am to convert the existing ladder logic from one PLC (mitsubishi) to another (Tricon). I am to use fb (function bloack diagrams) on the tricon plc, i.e. need to know how to convert ladder logic to FB diagrams.

Can you help me as to the process, in which i have to follow to get this completed.

Ken Moore · November 9th, 2005, 12:02 PM

Convert the ladder logic to a flow chart, then convert the flow chart to the new PLC using Function Block's.

chanuajohnson · November 9th, 2005, 01:51 PM

Thanks alot kenmore,

My problem with that is, first of all the ladder logic logic i am using has for example some initializations with registers, parameter initailizations, setting default values and what not together with relays , how do I capture that in a flow diagram.

See attached

Hope to hear from you soon

SimonGoldsworthy · November 10th, 2005, 08:08 AM

Can you define your project requirements in more detail ?

For example what form is the source plc code in ? (e.g. a print out, vendor specific files ?)
What will be doing the conversion process (e.g. a computer program, you ?)

How will the projects success be tested ?

Lancie1 · November 10th, 2005, 06:32 PM

Surely in your training you have been taught how to make a basic flow diagram!
Flow Diagram:



      | 

      |

    /    \

   /      \

  /        \

 /          \   YES   +------------+

/M9036 True? \--------|R20 = D2005 |

\            /        |R10 = D2006 |

 \          /         |R12 = D2007 |

  \        /          |R21 = D2009 |

   \      /           +-----+------+

    \    /                  |

       |                    |

       |  |-----------------+              

       | NO (continue to next rung)

       |

chanuajohnson · January 4th, 2006, 07:56 AM

SimonGoldsworthy vbmenu_register("postmenu_127454", true); : I will be doing the conversion, and the original is in FB's on a mitsubishi and i need to convert to FB's on tricon

Lancie : I haveno training whatso ever, this is within the last 3 months i been new to this all vbmenu_register("postmenu_127454", true);

November 9th, 2005, 11:00 AM	#1
chanuajohnson Member Join Date: Nov 2005 Location: trinidad Posts: 13	ladder logic to fb diagrams Hi all, i am an undergraduate student currently doin aproject, I need help i have no idea how to do what i have to do. I am to convert the existing ladder logic from one PLC (mitsubishi) to another (Tricon). I am to use fb (function bloack diagrams) on the tricon plc, i.e. need to know how to convert ladder logic to FB diagrams. Can you help me as to the process, in which i have to follow to get this completed.

November 9th, 2005, 12:02 PM	#2
Ken Moore Member Join Date: May 2004 Location: Upstate South Carolina Posts: 2,325	Convert the ladder logic to a flow chart, then convert the flow chart to the new PLC using Function Block's. __________________ "To give real service you must add something that cannot be bought or measured with money; and that is sincerity and integrity." - Donald A. Adams

November 10th, 2005, 06:32 PM	#5
Lancie1 Lifetime Supporting Member + Moderator Join Date: Jul 2003 Location: Alabama Posts: 8,083	Surely in your training you have been taught how to make a basic flow diagram! Flow Diagram: \| \| / \ / \ / \ / \ YES +------------+ /M9036 True? \--------\|R20 = D2005 \| \ / \|R10 = D2006 \| \ / \|R12 = D2007 \| \ / \|R21 = D2009 \| \ / +-----+------+ \ / \| \| \| \| \|-----------------+ \| NO (continue to next rung) \|

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November 10th, 2005, 08:08 AM	#4
SimonGoldsworthy Member Join Date: Mar 2005 Location: England Posts: 1,079	Can you define your project requirements in more detail ? For example what form is the source plc code in ? (e.g. a print out, vendor specific files ?) What will be doing the conversion process (e.g. a computer program, you ?) How will the projects success be tested ?

January 4th, 2006, 07:56 AM	#6
chanuajohnson Member Join Date: Nov 2005 Location: trinidad Posts: 13	SimonGoldsworthy vbmenu_register("postmenu_127454", true); : I will be doing the conversion, and the original is in FB's on a mitsubishi and i need to convert to FB's on tricon Lancie : I haveno training whatso ever, this is within the last 3 months i been new to this all vbmenu_register("postmenu_127454", true);

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